Water quality characteristics and sediments endogenous pollution of subtropical stratified reservoir
WANG Bin1,2, HUANG Ting-lin1,2, CHEN Fan1,2, YANG Peng-cheng1,2, YEYan-zhong3, ZHAIZhen-qi3, ZHOUBi-wen4
1. Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, China; 2. Shaanxi Key Laboratory of Environmental Engineering, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; 3. Xikeng Reservoir Management Institute, North Water Resources Engineering Management Office, Guangdong, Shenzhen 518110, China; 4. Shenzhen Nanbo Environmental Technology Co., Ltd., Guangdong, Shenzhen 518110, China
Abstract：To explore the impact of sediment endogenous pollution on subtropical stratified water source reservoirs (Xikeng Reservoir), a combination of in-situ monitoring and indoor simulation was used to analyze the water temperature and dissolved oxygen, nitrogen and phosphorus in the deep water area of the Xikeng Reservoir from May to September 2020. The oxygen consumption rate of sediments in Xikeng Reservoir and the release flux of nitrogen and phosphorus in the sediments were analyzed by the static experimental simulation method. The results of in-situ monitoring showed that the water temperature and dissolved oxygen in Xikeng Reservoir were in stratified state from May to September, and the dissolved oxygen in the bottom of the reservoir was low during this period, which provides prerequisites for the anaerobic release of endogenous pollutants from sediments. In the stratification stage, the concentrations of ammonia nitrogen and total phosphorus in bottom water were significantly higher than those in surface and middle water (P<0.01). The corresponding average concentrations of ammonia nitrogen and total phosphorus in surface water were 0.062mg/L and 0.033mg/L, respectively, while those in middle water were 0.058mg/L and 0.037mg/L, and those in bottom water were 0.242mg/L and 0.052mg/L. Static simulation experiments showed that the oxygen consumption of both water and sediments was in line with the zero-order reaction kinetics model (R2 was 0.987 and 0.989, respectively). The oxygen consumption rate of sediments was 1.03g/(m2·d), which was about 1.45times of that of water. The oxygen consumption of sediment induced the reduction of dissolved oxygenand the release of sediment endogenous pollution. The maximum release value of ammonia nitrogen was 0.261mg/L, and the average release flux was 7.36mg/(m2·d). The maximum release value of total phosphorus was 0.108mg/L, and the average release flux was 2.20mg/(m2·d). The release of endogenous ammonia nitrogen and total phosphorus contributed 27.98% and 38.92% to the water, and the release of nitrogen and phosphorus from sediments had a significant effect on the water quality of the reservoir.
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